<template>
	<view class="container">
		<view :style="{height:content_height}">
			<!-- 空白页 -->
			<view v-if="empty===true" class="empty">
				<image src="/static/emptyCart.jpg" mode="aspectFit"></image>
				<view class="empty-tips">
					空空如也
				</view>
			</view>
			<view v-else>
				<!-- 列表 -->
				<view class="cart-list">
					<block v-for="(item, index) in cartList" :key="item.id">
						<view
							class="cart-item" 
							:class="{'b-b': index!==cartList.length-1}"
						>
							<view class="image-wrapper">
								<image :src="item.image" 
									:class="[item.loaded]"
									mode="aspectFill" 
									lazy-load 
									@load="onImageLoad('cartList', index)" 
									@error="onImageError('cartList', index)"
								></image>
								<view 
									class="myicon icon-yuanxingxuanzhong checkbox"
									:class="{checked: item.checked}"
									@click="check('item', index)"
								></view>
							</view>
							<view class="item-right">
								<text class="clamp title" @click="nav('/pages/shop/goods/detail')">{{item.title}}</text>
								<text class="attr">{{item.attr_val}}</text>
								<text class="price">¥{{item.price}}</text>
								<NumberBox 
									class="step"
									:min="1" 
									:max="item.stock"
									:value="item.number>item.stock?item.stock:item.number"
									:isMax="item.number>=item.stock?true:false"
									:isMin="item.number===1"
									:index="index"
									@eventChange="numberChange"
								></NumberBox>
							</view>
							<text class="myicon icon-shanchu1" @click="deleteCartItem(index)"></text>
						</view>
					</block>
				</view>
				<!-- 底部菜单栏 -->
				<view class="action-section">
					<view class="checkbox align-center">
						<text :class="{'myicon icon-yuanxingxuanzhong text-color bg-white':true,'disabled-color':!allChecked}" style="font-size: 54upx;z-index: 5;border-radius: 100%;" @click="check('all')"></text>
						<view class="clear-btn" :class="{show: allChecked}" @click="clearCart">
							清空
						</view>
					</view>
					<view class="total-box">
						<text class="price">¥{{total}}</text>
						<text class="coupon">
							已优惠
							<text>74.35</text>
							元
						</text>
					</view>
					<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
				</view>
			</view>
		</view>
		<view :style="{height:`${constant.bottom_bar_height}px`}">
			<BottomBar v-model='barIndex'  :barlists="barlists"/>
		</view>
	</view>
</template>

<script>
	import NumberBox from '@/components/NumberBox.vue'
	import config from '@/pages/shop/config.js'
	export default {
		components: {
			NumberBox
		},
		data() {
			return {
				constant:this.constant,
				barlists:config.barlists,
				content_height: 0,
				barIndex: 3,
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: false, //空白页现实  true|false
				cartList: [],
			};
		},
		onLoad(){
			this.getData();
		},
		mounted() {
			this.content_height = `calc(100vh - ${this.constant.bottom_bar_height}px)`
		},
		watch:{
			//显示空白页
			cartList(e){
				let empty = e.length === 0 ? true: false;
				if(this.empty !== empty){
					this.empty = empty;
				}
			}
		},
		methods: {
			//请求数据
			async getData(){
				let list = this.Json.cartList; 
				let cartList = list.map(item=>{
					item.checked = true;
					return item;
				});
				this.cartList = cartList;
				this.calcTotal();  //计算总价
			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = this.baseURL + '/assets/img/errorImage.jpg';
			},
			navToLogin(){
				uni.navigateTo({
					url: '/pages/public/login'
				})
			},
			 //选中状态处理
			check(type, index){
				if(type === 'item'){
					this.cartList[index].checked = !this.cartList[index].checked;
				}else{
					const checked = !this.allChecked
					const list = this.cartList;
					list.forEach(item=>{
						item.checked = checked;
					})
					this.allChecked = checked;
				}
				this.calcTotal(type);
			},
			//数量
			numberChange(data){
				this.cartList[data.index].number = data.number;
				this.calcTotal();
			},
			//删除
			deleteCartItem(index){
				let list = this.cartList;
				let row = list[index];
				let id = row.id;

				this.cartList.splice(index, 1);
				this.calcTotal();
				uni.hideLoading();
			},
			//清空
			clearCart(){
				uni.showModal({
					content: '清空购物车？',
					success: (e)=>{
						if(e.confirm){
							this.cartList = [];
						}
					}
				})
			},
			//计算总价
			calcTotal(){
				let list = this.cartList;
				if(list.length === 0){
					this.empty = true;
					return;
				}
				let total = 0;
				let checked = true;
				list.forEach(item=>{
					if(item.checked === true){
						total += item.price * item.number;
					}else if(checked === true){
						checked = false;
					}
				})
				this.allChecked = checked;
				this.total = Number(total.toFixed(2));
			},
			//创建订单
			createOrder(){
				let list = this.cartList;
				let goodsData = [];
				list.forEach(item=>{
					if(item.checked){
						goodsData.push({
							attr_val: item.attr_val,
							number: item.number
						})
					}
				})

				uni.navigateTo({
					url: `/pages/order/createOrder?data=${JSON.stringify({
						goodsData: goodsData
					})}`
				})
				this.error('跳转下一页 sendData');
			}
		}
	}
</script>

<style lang='scss'>
	.container{
		height: 100vh;
		padding-bottom: 134upx;
		/* 空白页 */
		.empty{
			position:fixed;
			left: 0;
			top:0;
			width: 100%;
			height: 100vh;
			padding-bottom:100upx;
			display:flex;
			justify-content: center;
			flex-direction: column;
			align-items:center;
			background: #fff;
			image{
				width: 240upx;
				height: 160upx;
				margin-bottom:30upx;
			}
			.empty-tips{
				display:flex;
				font-size: $font-sm+2upx;
				color: $font-color-disabled;
				.navigator{
					color: $uni-color-primary;
					margin-left: 16upx;
				}
			}
		}
	}
	/* 购物车列表项 */
	.cart-item{
		display:flex;
		position:relative;
		padding:30upx 40upx;
		.image-wrapper{
			width: 230upx;
			height: 230upx;
			flex-shrink: 0;
			position:relative;
			image{
				border-radius:8upx;
			}
		}
		.checkbox{
			position:absolute;
			left:-16upx;
			top: -16upx;
			z-index: 8;
			font-size: 44upx;
			line-height: 1;
			padding: 4upx;
			color: $font-color-disabled;
			background:#fff;
			border-radius: 50px;
		}
		.item-right{
			display:flex;
			flex-direction: column;
			flex: 1;
			overflow: hidden;
			position:relative;
			padding-left: 30upx;
			.title,.price{
				font-size:$font-base + 2upx;
				color: $font-color-dark;
				height: 40upx;
				line-height: 40upx;
			}
			.attr{
				font-size: $font-sm + 2upx;
				color: $font-color-light;
				height: 50upx;
				line-height: 50upx;
			}
			.price{
				height: 50upx;
				line-height:50upx;
			}
		}
		.del-btn{
			padding:4upx 10upx;
			font-size:34upx; 
			height: 50upx;
			color: $font-color-light;
		}
	}
	/* 底部栏 */
	.action-section{
		/* #ifdef H5 */
		margin-bottom:100upx;
		/* #endif */
		position:fixed;
		left: 30upx;
		bottom:30upx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 690upx;
		height: 100upx;
		padding: 0 30upx;
		background: rgba(255,255,255,.9);
		box-shadow: 0 0 20upx 0 rgba(0,0,0,.5);
		border-radius: 16upx;
		.checkbox{
			height:52upx;
			position:relative;
		}
		.clear-btn{
			position:absolute;
			left: 26upx;
			top: 0;
			z-index: 4;
			width: 0;
			height: 52upx;
			line-height: 52upx;
			padding-left: 38upx;
			font-size: $font-base;
			color: #fff;
			background: $font-color-disabled;
			border-radius:0 50px 50px 0;
			opacity: 0;
			transition: .2s;
			&.show{
				opacity: 1;
				width: 120upx;
			}
		}
		.total-box{
			flex: 1;
			display:flex;
			flex-direction: column;
			text-align:right;
			padding-right: 40upx;
			.price{
				font-size: $font-lg;
				color: $font-color-dark;
			}
			.coupon{
				font-size: $font-sm;
				color: $font-color-light;
				text{
					color: $font-color-dark;
				}
			}
		}
		.confirm-btn{
			padding: 0 38upx;
			margin: 0;
			border-radius: 100px;
			height: 76upx;
			line-height: 76upx;
			font-size: $font-base + 2upx;
			background: $base-color;
			box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72)
		}
	}
	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked{
		color: $base-color;
	}
</style>
